Clean Rivers, Clean Lake 8 -- Smart Snow and Ice Removal -- Connie Fortin


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  • City of Mankato maintenance yard. Anti-icing applied hours before this photo was takenDry
  • Same LCS Treatment. Pavement temperature have risen to 15 degrees F. Light snow is falling
  • LCS Treatment at 15 degrees F pavement temps
  • Note the difference between the anti-icing photo and the typical city street photo. Same day, same storm, same time.
  • These saddle tanks hold 100 gallons each they’ll come1/side but 2/side can be done. The Tailgate tank can be adapted to fit on this truck to carry a total of 600 gallons total on the truck. You would be adding 6000 pounds to the total weight.
  • On 33’s the tailgate tank holds 100 gallons On 35’s the tailgate tank holds 200 gallons
  • Will talk more benefits of anti-icing vs de-icing but basically the concept of anti-icing is to apply a thin layer of material prior to storm event to create a barrier between the pavement and the ice. To allow for mechanical snow and ice removal Anti-icing material can be applied at a faction of the de-icing rate
  • Clean Rivers, Clean Lake 8 -- Smart Snow and Ice Removal -- Connie Fortin

    1. 1. The Latest in Smart Snow and Ice Control Connie Fortin – Fortin Consulting Inc
    2. 2. This talk is based on excerpts from the Minnesota voluntary certification
    3. 3. The Situation SALT USE forWINTER SAFE TRAVEL Permanently Polluted Water
    4. 4. How does salt affect our waters and what canwe do about it?
    5. 5. Salt becomes invisible but it doesn’t disappear. It mixes with water and stays in solution.
    6. 6. The U.S. Government has standards for pollutants• Chronic standard for Chlorides: 230 mg/l = 1 teaspoon salt in 5 gallons water
    7. 7. National: Exceedances of EPA Water Quality Criteria for Cl# of Sites 12 6 21 6 29 15 7 7 11 12 17 14 5 19 22 6 3 162 506739/5266 1383/995
    8. 8. Comparison of lake chloride concentrations in 39 Minnesota lakes and rock salt purchases by the state of Minnesota (Novotny et al. 2007).
    9. 9. 1 ton of rock salt ($50) causes greater than $1,450 in corrosion damage to bridges, vehicles, and environment (TRB Report)Ali Akbar Sohanghpurwala- Road Salt Symposium 2008 (photo and fact)
    10. 10. Working with the maintenance industry is the key to safe surfaces and clean water
    11. 11. Store on impermeable pad and coveredStorage areas are #1 risk for groundwater contamination. If your pilecontaminates the ground water youwill be held responsible
    12. 12. Be safe:Secondary containment or double wall tanks Storage: Liquids
    13. 13. Plan for year round storageDo not use salt just to get rid ofit at the end of the winter.
    14. 14. How salt works
    15. 15. Speed of Melting Pavement One Pound of Melt TimesTemperature º F Salt (NaCl) Melts 30 46.3 lbs of ice 5 min. 25 14.4 lbs of ice 10 min. 20 8.6 lbs of ice 20 min. 15 6.3 lbs of ice 1 hour 10 4.9 lbs of ice Dry salt is 5 4.1 lbs of ice ineffective and will blow away 0 3.7 lbs of ice before it melts -6 3.2 lbs of ice anything
    16. 16. Know the Lowest practical melting temperature for each material Chemical Lowest Practical Eutectic Temp. Optimal Melting Temp. ConcentrationSodium Chloride 15º F -6º F 23% Magnesium Chloride -10º F -28º F 27 to 30%CaCl2 (Calcium -20º F -60º F 30% Chloride)CMA (Calcium Magnesium 20º F -18º F 32% Acetate)KAc (Potassium Acetate) -15º F -76º F 50% Blends Talk to supplier Talk to supplier Talk to supplier Winter Never melts -- Never melts --Sand/Abrasives traction only traction only
    17. 17. Use application rate tables! rates are low, they are a good target, not a starting point
    18. 18. Yearly Calibration Pg 10 Calibration should be the backbone of your snow and ice program!
    19. 19. Calibration separates the topperforming organization from the average organizations
    20. 20. If you are applying materials with only your eyes to judge.Look for better ways!
    21. 21. Almost twice the rate doesn’t “look” that different 500 300
    22. 22. Many types of equipment can be calibrated:
    23. 23. Projected ResultsAverage potential reduction in salt application rates: 62% for parking lot/sidewalk 36% for roads
    24. 24. Integrating Liquids• Good for public safety• Improved performance• Cost effective• Better for the environment• IT IS IN YOUR FUTURE
    25. 25. The purpose of deicers is toprevent the bond from formingbetween the pavement and the ice, not to melt the ice. We only need to melt this little layer Ice Pavement
    26. 26. Without the bond the plow, shovelor snow blower will do a great job Ice Pavement
    27. 27. It will take 10 times more work and/or 4 times more chemical tobreak a bond than to prevent a bond Ice Pavement
    28. 28. Anti-icing – Applying liquids before the storm EnviroTech LCS
    29. 29. 4 Hours Later
    30. 30. • The snow will accumulate but the surface underneath is wet• The bond is weak
    31. 31. The time to get your site back after thestorm will be reduced if you anti-ice You will not have trouble with frost if you have anti-iced
    32. 32. Anti-icing is like frying eggs
    33. 33. Mixing liquids with dry saltWet salt increases the speed of melting! Salt can start working NOW, no delay.
    34. 34. Salt Retrieved from 78% 24ft. pavement Unretreived salt P r 46% e - D 30% w r y 9% 12% 12% 9% e t 4% Michigan Highway Department Outside 1/3 Center 1/3 Outside 1/3
    35. 35. With wet salt you can use 30% less…. just turn down your application rate.
    36. 36. Two good options for adding liquids: On the truck or on the Stockpile Pre-wet Pre-treat
    37. 37. Potential Cost Savings Hypothetical Example:Material Cost/ton Amt. Total cost neededDry salt $70 10 tons $700Wet salt $90 6.6 tons $594
    38. 38. 1 year after Training:Saved Rock salt: 617 tons (68%)$55,000 thefirst year MgCl2: 80 tons (65%) Mississippi River Reduced: Road salt 41% Mag chloride 51% Photo taken by Bobak Ha’Eri Sand 99%
    39. 39. Actual Results• As for the state budget…The salt savings at the U of MN alone in one year ($55,000) more than paid for one year of training across the state.
    40. 40. Minnesota’s Next Steps
    41. 41. Twin Cities Metro Area Chloride Management Plan •Minnesota is developing a Twin Cities metro area chloride management plan. Emphasizing working partnerships between industry and environment •Will result in better understanding of our lakes and rivers •Based on water quality information salt reduction targets will be given based on geographic areas (2014). They will be formulated to protect good water and to restore polluted water •Tools are being developed to help organizations assess their operations and move towards lower impact practices •No practices will be mandated. Maintenance operations will have flexibility in making changes appropriate to their organizations to achieve salt reduction targets.For more information contact: Brooke Asleson MPCA Project Manager:
    42. 42. Housekeeping Section:Chart your current and near future practices Internal internal calculationNow Near Practices Code Future 1 Move from 1 to 2 = Bulk salt pile uncovered 1% reduction 2 Bulk salt pile tarped Move from 1 to 3 = 5% reduction 3 Move from 2 to Bulk salt pile indoors 3 = 5% reduction standard best practice Remedial practice Advanced best practice
    43. 43. What type of training is available in your area? Can you provide useful tools to help maintenance professionals make better decisions?
    44. 44. The future is in our hands